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SN74CBT3125C: SN74CBT3125C vs SN74CBT3125

R.Fukunaga
Expert 2695 points
Part Number: SN74CBT3125C
Other Parts Discussed in Thread: SN74CBT3125,

Tool/software:

Hi all,

I would like to ask about the difference between SN74CBT3125C and SN74CBT3125 as follows.

1) Protocols, 

SN74CBT3125:Analog

SN74CBT3125C:Analog,I2C,I2S,JTAG,RGMII,SPI,TDM,UART

Does it simply mean the coverage of SN74CBT3125C was expanded?

2) Cio(ON) (typ) (pF) value, 

SN74CBT3125:not mentioned in D/S

SN74CBT3125C:12.5pF

Do you have actual Cio(ON) (typ) value of SN74CBT3125? ,or do you have any idea to estimate it?

3) ON-state leakage current (max) (μA), 

The image is taken from this comparison table (Compare products) as follows.

Which spec does it correspond ''ON-state leakage current (max) (μA) '' in each D/S?

Best Regards,

Ryusuke

  • +1
    TI__Mastermind 35648 points

    Hi Ryusuke,

    SN74CBT3125 and SN74CBT3125C are effectively the same but the C version has added undershoot protection and can be operated when supply is 0V. Behaviorally they will be extremely similar and it most cases you wouldn't be able to notice the difference. There is slightly better RON on the non-C version but slightly higher capacitance. Typically if the Coff is lower then CON will be lower.
    Con can usually be estimated by slightly above double the Coff. This is especially easier when the Coff is small like the 4pF we have. I would estimate that the non-C version has about 10pF Con.

    As for the leakage, I'm not sure where they pulled that information for the comparison table from the product folder.  The on-leakage isn't spec'ed in the non-C version so I'm guessing at some point somebody mixed up the on-leakage spec with the leakage of the control pins. They should be about the same.

    Thanks,
    Rami